Clash Royale CLAN TAG#URR8PPP

Conditional selecting in function

I have the following object with orders of a restaurant.

var obj =
orders: [
null,

date: "2018-07-09 10:07:18",
orderVerified : true,
item: [

name: "apple juice",
price: 3.9,
quantity: 1,
isDrink: true
,

name: "Hawaii pizza",
price: 7,
quantity: 2,
isDrink: false

]
,

date: "2018-07-09 10:07:30",
orderVerified : false,
item: [

name: "Warmer Topfenstrudel",
price: 3.9,
quantity: 1,
isDrink: false

]
,

date: "2018-07-09 15:07:18",
orderVerified : true,
item: [

name: "Coca Cola 2 l",
price: 12.9,
quantity: 3,
isDrink:true

]
,

date: "2018-06-13 10:07:18",
orderVerified : true,
item: [

name: "Wiener Schnitzel vom Schwein",
price: 9.9,
quantity: 2,
isDrink: false

]

]
;


I want to summing up the item's prices * items quantities if the value of isDrink is true.
I've tried to use this function, which get the total of all items. but I can check check wether isDrink is true or false, but how could I summing up the drinks prices * quantities?

fullTotal: function(arr)
if (arr!='')
return arr.reduce((sum, order) =>
return sum + order.item.reduce((itemSum, item) => (
itemSum + (item.price * item.quantity)
), 0)
,0)
else return 0
,


Please give me some suggestion with this. Thank you!

3 Answers
3

Try it. You had to filter array from null values in your case.

null

var obj =
orders: [
null,

date: "2018-07-09 10:07:18",
orderVerified: true,
item: [
name: "apple juice",
price: 3.9,
quantity: 1,
isDrink: true
,

name: "Hawaii pizza",
price: 7,
quantity: 2,
isDrink: false

]
,

date: "2018-07-09 10:07:30",
orderVerified: false,
item: [
name: "Warmer Topfenstrudel",
price: 3.9,
quantity: 1,
isDrink: false
]
,

date: "2018-07-09 15:07:18",
orderVerified: true,
item: [
name: "Coca Cola 2 l",
price: 12.9,
quantity: 3,
isDrink: true
]
,

date: "2018-06-13 10:07:18",
orderVerified: true,
item: [
name: "Wiener Schnitzel vom Schwein",
price: 9.9,
quantity: 2,
isDrink: false
]

]
;

function fullTotal(arr)
if (arr != '')
return arr.filter(order => order != null).reduce((sum, order) =>
return sum + order.item.filter(item => item.isDrink).reduce((itemSum, item) => (
itemSum + item.isDrink ? (item.price * item.quantity) : 0
), 0)
, 0)
else
return 0



console.log(fullTotal(obj.orders));

Try this

fullTotal: function(arr)
if (arr!='')
return arr.reduce((sum, order) =>
return sum + order.item.reduce((itemSum, item) => (
itemSum + item.isDrink ? (item.price * item.quantity) : 0
), 0)
,0)
else return 0
,


You could add a check for an array and check the needed object and isDrink. Then return the sum

isDrink

var obj = orders: [null, date: "2018-07-09 10:07:18", orderVerified: true, item: [ name: "apple juice", price: 3.9, quantity: 1, isDrink: true , name: "Hawaii pizza", price: 7, quantity: 2, isDrink: false ] , date: "2018-07-09 10:07:30", orderVerified: false, item: [ name: "Warmer Topfenstrudel", price: 3.9, quantity: 1, isDrink: false ] , date: "2018-07-09 15:07:18", orderVerified: true, item: [ name: "Coca Cola 2 l", price: 12.9, quantity: 3, isDrink: true ] , date: "2018-06-13 10:07:18", orderVerified: true, item: [ name: "Wiener Schnitzel vom Schwein", price: 9.9, quantity: 2, isDrink: false ] ] ,
fullTotal = function (array)
return Array.isArray(array)
? array.reduce((sum, o) => o && Array.isArray(o.item)
? o.item.reduce((s, price, quantity, isDrink ) => s + (isDrink && price * quantity), sum)
: sum, 0)
: 0;
;

console.log(fullTotal(obj.orders));

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